Excellent product, fits true to size.
Bought these for my daughter, she loves them. Keeps her comfortable and prevents any leaks on her heaviest nights.
Great service and great product.
How to make your daughter's first period EASY and FUN!CLICK HERE TO READ.
Welcome to Knicked, Welcome to Puberty and Periods SHOP HERE
Terms & Policies
Please see each product page, for individual sizing.
As a general rule, please choose the same size for our period undies and period swimwear as your child's regular underwear size.
Our period underwear is designed here using Australian Child/Youth underwear guidelines. It's important to note that child sizing, also crosses over into women's sizing at our 12/14, so we have also shown this on our sizing charts (on each individual product page) to assist.
We also understand purchasing online can make judging sizing difficult and everyone has a different body shape (literally hundreds of waist & hip combinations) so we have created guides on each product page to help you choose the best fit for each product, or feel free to email our helpful team at theteam@knicked.com.au with waist & hip measurements so we can assist further.
To measure against existing underwear: use the flat lay measurement (side seam to side seam on the waistband) to compare with their current underwear.
Don't panic if you do find you've ordered the wrong size, KNICKED will happily exchange sizing and also cover the postal costs to reship (once per order) as long as underwear has been tried on over clean underwear and returned in AS NEW condition (not washed/worn free of lint/hair/marks), and packaging in original condition.
Please click here for our Exchange/Refund Forms & Guidelines to organise an exchange.
Knicked UltraGuard™ Boyleg Period Shorts
5-Way Super Heavy Protection for All Bodies
Super heavy flow? Side leaks? Need extended sizes?
We've got you covered.
Our Knicked UltraGuard™ Boyleg Shorts are the upgraded version of our popular boyleg design - now with extended sizing up to women's size 20/22, longer crotch design, and full coverage absorption that reaches all the way to the waistband front AND back. With 5-way protection and slip-in pockets, these are your new best mate for super heavy days.
💖 What Makes Them Different?
Unlike regular period underwear, our UltraGuard features:
✔ 5-way absorbency protection (front waistband to back waistband, sides & inner leg)
✔ Super heavy absorbency (50mls) for all-day confidence
✔ Extended sizing (Child 10 - Adult 22)
✔ Longer crotch design with wider protection
✔ 2 slip-in pockets for phone, money or keys
✔ Thin, fast-drying & fitted design
✔ Super soft cotton blend
✔ Boyleg style for maximum coverage
That means total protection from every angle - no more side leaks, just complete peace of mind.
👍🏼 Perfect For:
• Super heavy flow days
• Side leak prevention
• All-day wear under dresses & skirts
• Active days when you can't keep checking
• Tweens, teens & adults (all sizes)
🌿 Designed for All Bodies
Created by a mum, designed for heavier flows.
Our UltraGuard is:
• Super heavy absorbency (5-way protection)
• Reusable & sustainable
• Super soft & comfortable
• Extended sizing for more bodies
• Made to keep you dry and confident
Because super heavy periods shouldn't mean leaks, limits, or missing out on life.
Knicked period undies have always been and will continue to be FREE FROM NASTIES such as PUL'S (plastics) or PFAS (chemicals).


* Our model on the left is wearing a size Teen 12/14 our Plus Size Model is wearing size 18/20 and our model on the right is wearing a size 14/16.
* To measure against another brand of underwear please use the flatlay measurements - side seam to side seam along the waistband.
Tracked postage is $9.95
Express postage is $14.50
Orders over $99 receive complimentary FREE REGULAR SHIPPING
Knicked will exchange item(s) that have not been washed, worn and are in AS NEW condition, we request you submit our Exchange Form within 14 days of receiving your product. Knicked will cover one new shipping cost as a gift to assist - please note: if purchased on sale or outside Australia item(s) can ONLY be returned for a gift voucher to repurchase a new size or style within 5yrs.
Excellent product, fits true to size.
Bought these for my daughter, she loves them. Keeps her comfortable and prevents any leaks on her heaviest nights.
Great service and great product.